. Elements of geology, or, The ancient changes of the earth and its inhabitants as illustrated by geological monuments. Geology. 522 MOUNTAIN LIMESTONE. [Ch. XXV. Fig. 5S3. be restricted to a very few species, among which Textularia, Nodo- saria, Undothyra, and Fusulina (fig. 583), have "been recognized. The first two genera are common to this and all the after periods; the third has been found in the Upper Silurian, but is not known above Fumiina cyiin- the Carboniferous strata; the fourth (fig. 583) is drica, D'Orb. peculiar to the Mountain Limestone, and is charac- Magnified 3 diain. ^
. Elements of geology, or, The ancient changes of the earth and its inhabitants as illustrated by geological monuments. Geology. 522 MOUNTAIN LIMESTONE. [Ch. XXV. Fig. 5S3. be restricted to a very few species, among which Textularia, Nodo- saria, Undothyra, and Fusulina (fig. 583), have "been recognized. The first two genera are common to this and all the after periods; the third has been found in the Upper Silurian, but is not known above Fumiina cyiin- the Carboniferous strata; the fourth (fig. 583) is drica, D'Orb. peculiar to the Mountain Limestone, and is charac- Magnified 3 diain. ^^ q£ ^ formation in the United gtates Arctic Mountain Lime- . . stone. America, Russia, and Asia Minor. STRATA CONTEMPORANEOUS WITH THE MOUNTAIN LIMESTONE. Fig. 5S4. In countries where limestone does not form the principal part of the Lower Carboniferous series, this formation assumes a very differ- ent character, as in the Rhenish Provinces of Prussia, and in the Hartz. The slates and sandstones called Kiesel-schiefer and Younger Greywacke (Jungere Grauwaeke) by the Germans, were formerly re- ferred to the Devonian group, but are now ascertained to belong to the " Lower ; The prevailing shell which character- izes the carbonaceous schists of this series, both on the Continent and in England, is Posidonomya Becherl (fig. 584). Some well-known moun- tain-limestone species, such as Go- niatites crenistria (see fig. 579), and G. reticulatus, also occur in the Hartz. In the associated sandstones of the same region, fossil plants, such as Lepidodendron and the allied ge- nus Sagenaria, are common; also Knorria, Calamites SucJcovii, and C. transitionis, Gopp., some peculiar, others specifically identical with ordinary coal-measure fossils. The true geological position of these rocks in the Hartz was first deter- mined by MM. Murchison and Sedgwick in 1840.*. Posidonomya Becheri, Gold, Syn. Estheria Becheri. Lower Carboniferous. CARBONIFEROUS LIMESTONE IN NORT
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Keywords: ., bookcentury1800, bookdecade1860, booksubjectgeology, bookyear1868
